Thank you for viewing. This is the Nikon MF-28 Multi-Control Back for the F5. I purchased this new at a camera store when I bought my F5 over 20 years ago and used it, but I am now selling my F5, so I am also listing this. As shown in the third photo, I have confirmed that it works when attached to the F5 without a button battery. The items included are shown in the fourth photo. This is a used item, so please understand. I am also listing the F5 body, so please consider that as well.